This change allows users to specify a custom nginx.conf.sigil that can expose non-web process types to the outside world in addition to the web process type.
Closes#3258
This enables the HSTS header by default when an SSL certificate is in use. HSTS options can also be managed via the nginx:set command, which also exposes the ability to disable HSTS for your application.
I was working on a Dockerfile deploy that was setup to listen on port 8844. I wanted to add ssl and couldn't figure out why adding the ssl cert didn't making things 'just work'. Since the `proxy:ports-add` step I discuss in this commit is run both `under the hood` and `sometimes`, I thought it might be worth issuing a PR for.
When configuring domains/ssl certificates, the port mappings for an application may be automatically set. This can cause issues for applications which will use non-standard ports - ie. for Dockerfile deploys.
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